#include <stdio.h>
#include <math.h>
int main(void)
{
    double a, b, c, s, x1, x2;
    printf("plz,type three parameters of the equation\n");
    scanf("%lf%lf%lf", &a, &b, &c);
    s = pow(b,2.0)-4*a*c;
    if(s>0)
    {
        x1 = (-b + sqrt(s))/(2*a);
        x2 = (-b - sqrt(s))/(2*a);
        printf("x1=%.2lf, x2=%.2lf\n",x1,x2);
    }
    else if(s==0)
    {
        x1=x2=(-b)/(2.0*a);
        printf("x1=x2=%.2lf\n",x1);
    }
    else
        printf("No solution\n");
    return 0;
}